chore: update about page

source/about/index.md

@@ -15,10 +15,10 @@ A nice place to show yourself. You can add your own information in your site's `
 
 ![](http://ppoffice.github.io/hexo-theme-icarus/gallery/profile.png "")
 
-### Custom Search Engines
-Icarus uses Google as default search engine, but also provide custom search engines such as Swiftype and Baidu.
+### Self-hosted Insite Search Engine
+With the help of [Insight Search](https://github.com/ppoffice/hexo-theme-icarus/wiki/Search#insight-search), you can search anything inside your site without add any third-party plugin.
 
-![](https://ooo.0o0.ooo/2016/02/08/56b883cdd2e17.png)
+![](https://ooo.0o0.ooo/2016/04/07/57068467ad5ea.png)
 
 ### Custom Comment Services
 Icarus supports several comment services, give you better choices to communicate with your readers.

themes/icarus

@@ -1 +1 @@
-Subproject commit 99a47ee8d0b1301b4708efc0467e793b31d284a5
+Subproject commit d1776a09295b043a603e4dfb4588adbc05971d31